Mandrel



Aug. 29, 1944. r c. E. LAMPE, sR ,0

MANDREL Filed Nov. 14, 1942 2 Sheets-Sheet 1 Au 29, 1,944. C. E. LAMPE, SR 1 I 2,357,011

MANDREL Filed Nov. 14, 1942 2 Sheets-Sheet 2 IN VENTOR.

Patented Aug. 29, 1944 MANDREL Charles E. Lampe, Sr., Philadelphia, Pa., assignor, by direct and mesne assignments, of four-tenths to Charles Lovejoy, and one-tenth to Henry M. Kannee, bothof Washington, D. C.

Application November 14, 1942, Serial N 0. 465,626 In Canada October 17, 1942 3 Claims.

This invention relates to new and useful improvements in mandrels and more particularly to a mandrel of the spinner type adapted for use in the bending of copper or nickel tubing or iron pipe,-the primary object of the invention being to provide a device of this character which, when applied to the interior of the tubing or pipe while it is being bent, will prevent crimping and produce a smooth interior and exterior surface to said tubing or pipe.

A further object of the invention resides in providing a mandrel composed of assembled parts which may be quickly and readily brought together or disassembled for purposes of repair or shipment.

, intermediate of the ends of the body a reinforcing flange or rib 5 is formed to extend annularly thereof.

Abutting the front peripheral edge of the body 2 is a babbitt thrust bearing 6, aganst which is applied the end bearing plate 1. This bearing plate is secured through the medium of bolts 8 A still further object of the invention resides in providing a mandrel of the spinner type composed of two main units loosely linked together and each provided with a series of rollers for contact with the interior wall of the tubing or pipe as it is being bent.

Still another object of the invention resides in providing a device which is comparatively simple and durable in construction, inexpensive to manufacture and one which will be very efficient and useful in operation.

With these and numerous other objects in view, my invention consists in the novel features of construction, combination and arrangement of parts which will be hereinafter referred to and mor particularly pointed out in the specification and claims.

In the accompanying drawings forming a part of this application,

Figure 1 is a horizontal sectional view of the 3 device showing the improved mandrel applied to a tube which is abort to be bent;

Figures 2, 3, 4 and 5 are transverse vertical sectional views as seen on the lines 2-2, 3-3, 4-4, and 5-5, respectively, of Figure 1;

Figure 6 is a side elevation of the mandrel on a reduced scale;

Figure 7 is a side elevation of one of the units comprising th mandrel; and

Figure 8 is a sectional view thereof.

In describing the invention, I shall refer to the drawings, in which similar reference characters designate corresponding parts throughout the several views and in which the numeral I designates a section of 8" copper tubing, although the diameter of the tubing may be varied as desired.

This tubing is adapted to be bent around the to a tubular body member 9 which, for convenience, may be termed the spinner body. The spinner body 9 is surrounded by a multiplicity of rollers II! which extend longitudinally thereof and are spaced from each other circumferentially of the spinner head. The trunnions at the ends of these rollers, at one end of the body 9, fit in bearing openings II formed in the end bearing plate 1. The trunnions at the opposite ends of the rollers Ill fit in similar bearing openings i2 of an outer bearing plate H, the latter being also secured to the spinner body 9 by means of a plurality of set screws or dowel pins M.

The spinner body 9, provided with a bore leading from the inner end thereof, is also provided centrally, extending from the outer end thereof, with an enlarged recess l5 which is adapted to receive therein the rearwardly extending projection or shank [6 of a spinner head ll. This spinner head is also of solid metal, having the periphery thereof arcuately formed from the rear to the front faces thereof and the periphery is grooved for a portion of the length thereof, extending rearwardly from the rear end toward the front end as shown at I8. Within these lon itudinal grooves formed in the periphery of the spinner head are provided the additional rollers. l9, which'are somewhat barrel-shaped, the outside diameter thereof being designed to conform to the radius of the pipe or tubing. Trunnions formed at the rear ends of the rollers l9 fit into bearing openings 20 in the rear end 26 of the spinner head and an end bearing plate 2| is applied to the outer end of the spinner body which is provided with hearing openings 22 to receive the outer end trunnions of the rollers !9. The end bearing plat 2| is secured in place to the spinner head I! through the medium of a plurality of set screws or dowel pins 23.

The projection l6 of the spinner head is of a size permitting play between the faces thereof and the walls of the recess 15 into which said projection is introduced and said projection is provided with a transverse opening 24 through which extends a pin 25. The opening 24 is of a greater diameter than the pin 25 so as to provide a loose-linked connection, permitting the spinner head to rotate freely and substantially on a universal connection, thus providing a means whereby the spinner head may follow the contour of i the bend of the pipe or tubing. While I have shown but a single spinner head in connection with a spinner body, it will be understood, of course. that additional spinner heads may be supplied and connected one to the other in the manner in which the spinner head is connected with the spinner body, this being merely a question of duplication, although I have found it possible, in the bending of pipe of certain sizes to utilize merely a single spinner head with the spinner body.

Th spinner body and head are so connected that when the spinner body is moved or rotated, the spinner head will also be moved or rotated. The device is adapted to be moved longitudinally within a pipe and also rotated therewithin. To this end, the spinner body has the bore thereof from the rear end forwardly partially threaded, as shown at 26, to b engaged by the threaded extension 21 formed on the end of a drive shaft 28. The outer end of the drive shaft is solid and the rear portion thereofois hollow, as clearly shown in the drawings, although said shaft is of double extra strength to carry out th purposes for which the device is designed. Mounted on the drive shaft just beyond the rear end of the mandrel 2 is a split collar 29 which carries a ring 39 fitting through the inturned end 4 of the body 2, whereby the mandrel is centralized on the shaft and the spinner body secured in place with respect to the mandrel body. The collar is adapted to be secured together by means of bolts or the like 3|.

Thus, it will be seen that the various elements, including the mandrel body, spinner body and spinner head with their adjunctive parts may be quickly and readily assembled and secured together or disassembled when occasion requires with little or no difficulty. The drive shaft is adapted to be connected with a motor or other source of power (not shown) whereby the spinner body and spinner head may be moved longitudinally within the tubing or pipe to be bent and rotated within said tubing or pipe. After each bend in the pipe or tubing is completed, the mandrel is adapted to be moved longitudinally or withdrawn while being rotated, so that ridges, creases or outs on the interior wall of the pipe or tubing may be avoided. The rollers of the spinner body obviously aid in reduction of friction in the tubes or pipes.

From the foregoing description of the construction of my improved mandrel, the method of assembling and applying same to use will be readily understood and it will be seen that I have provided a simple, inexpensive and efficient means for carrying out the various objects of the invention.

While I have particularly described the elements best adapted to perform the functions set forth, it is obvious that various changes in form, proportion and in the minor details of construction may be resorted to, without departing from the spirit or sacrificing any of the principles of the invention.

What I claim is:

l. A mandrel of the class desorbed comprising a cylindrical body, a spinner body of substantially cylindrical formation secured to the cylindrical body, a drive shaft removably secured to said spinner body and to said cylindrical body, the periphery of said spinner body being provided with radially projecting flanges at front and rear ends, a plurality of rollers about said spinner body extending longitudinally thereof and rotatably supported in the flanges at ends of the spinner body, a spinner head of substantially cylindrical formation having the periphery thereof arcuately formed, said spinner head being loosely linked to the front end of said spinner body for universal tilting movement with respect to the latter, said spinner head being adapted for longitudinal and rotary movement with said spinner body, said spinner head being also formed with radial flanges at its front and rear ends, and a plurality of additional rollers extending longitudinally of the spinner head and rotatably supported in the flanges at ends of the spinner head, the peripheries of said last mentioned rollers being arcuately formed.

2. In a mandrel of the class described, a body member, a spinner body secured to said body member, a rotary drive shaft extending longitudinally through the body member and detachably secured to said spinner body, said spinner body being substantially cylindrical in formation and having a bore enlarged at its front end to form a pocket, disks mounted at ends of the spinner body and projecting radially therefrom to form flanges, a plurality of rollers extending longitudinally of the spinner body and rOtatably supported in the flanges at ends of said spinner body, a spinner head having a shank fitting within the pocket of the spinner body, a pin passing transversely through said spinner body and through a transversely extending slot in the shank and mounting the spinner head for universal tilting movement with respect to the latter and adapted to rotate with said spinner body, said spinner head being provided with radially extending flanges at its ends, a plurality of auxiliary rollers extending longitudinally of the spinner head and rotatably mounted in the flanges of said spinner head, the peripheries of said latter rollers being arcuately formed.

3. A mandrel of the class described comprising a spinner body substantially cylindrical and formed with a longitudinal bore, a drive shaft removably engaged in the rear end of the bore, said bore having its forward portion enlarged to form a pocket, a spinner head in front of the spinner body having a shank extending from its rear end and loosely received in said pocket and spaced from the walls and bottom of the pocket, said shank being formed with a transverse slot, a pin carried by the spinner body and passing transversely through the pocket and through the slot of said shank and mounting the spinner head for universal pivotal movement relative to the spinner body and causing the spinner head to move longitudinally with and rotate with the spinner body, said spinner head having a longitudinally arcuate peripheral surface to provide the spinner head with a forward taper rollers rotatably mounted about the spinner body and extendin longitudinally'thereof, and aux-- iliary rollers rotatably mounted'about the spinner head and extending longitudinally thereof,

the auxiliary rollers having their peripheries arcu CHARLES E. LAMIPE, ,SR. 

